205001161 has 4 divisors (see below), whose sum is σ = 205344000. Its totient is φ = 204658324.

The previous prime is 205001123. The next prime is 205001179. The reversal of 205001161 is 161100502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 205001161 - 2⁷ = 205001033 is a prime.

It is a super-2 number, since 2×205001161² = 84050952022695842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205001561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170521 + ... + 171718.

It is an arithmetic number, because the mean of its divisors is an integer number (51336000).

Almost surely, 2^205001161 is an apocalyptic number.

It is an amenable number.

205001161 is a deficient number, since it is larger than the sum of its proper divisors (342839).

205001161 is an equidigital number, since it uses as much as digits as its factorization.

205001161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342838.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 205001161 is about 14317.8616070976. The cubic root of 205001161 is about 589.6379671143.

Adding to 205001161 its reverse (161100502), we get a palindrome (366101663).

The spelling of 205001161 in words is "two hundred five million, one thousand, one hundred sixty-one".